IntegrityError:列“city_id"中的空值；违反非空约束 [英] IntegrityError: null value in column "city_id " violates not-null constraint

问题描述

我两个模型:

class City(models.Model):
    name = models.CharField(max_length=50)
    country = models.OneToOneField(Country)

    def __unicode__(self):
        return self.name 


class UserProfile(models.Model):
    user = models.OneToOneField(User)
    city = models.OneToOneField(City)

当我同步数据库并创建管理员用户时:

when I syncdb and create admin user :

IntegrityError: null value in column "city_id" violates not-null constraint

如何修复此错误?

推荐答案

city = models.OneToOneField(City)

您确定每个城市只需要一个用户吗?我认为你需要

Are you sure you want only one user per city? I think you need

city = models.ForeignKey(City, null=True, blank=True)

null, blank 因为 sycndb 将创建一个配置文件，如果没有通过 city 就会失败.

null, blank because the sycndb will create a profile and will fail if no city is passed.

或者，您可以将 default=default_city_id 传递给 city ForeignKey

Alternatively, you can pass default=default_city_id to the city ForeignKey

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